What is the difference between EuroLatin and EuroLatin2? I could not find a documentation about this, but on the surface, it seems the differences are rather small. Is EuroLatin2 essientially newer, maybe somewhat extended version of EuroLatin?

EuroLatin2 was originally developed as a touch layout specifically for mobile devices; we then merged the desktop and touch layouts. So yes, EuroLatin2 is a newer version of EuroLatin, and we will be pushing EuroLatin2 over EuroLatin in the future and probably phasing out the original keyboard.